diff --git a/fuzz/fuzz_targets/ast.rs b/fuzz/fuzz_targets/ast.rs
index c24959f86..a089c46ba 100644
--- a/fuzz/fuzz_targets/ast.rs
+++ b/fuzz/fuzz_targets/ast.rs
@@ -39,7 +39,7 @@ fn fuzz(ctx: Ctx) -> Result<()> {
     _ = black_box(ast.iter_functions().count());
     _ = black_box(ast.iter_literal_variables(true, true).count());
     _ = black_box(ast.walk(&mut |_| true));
-    _ = black_box(engine.gen_metadata_to_json(&ast, true));
+    _ = black_box(engine.gen_fn_metadata_with_ast_to_json(&ast, true));
 
     let mut function_only_ast = ast.clone_functions_only();
     assert!(function_only_ast.clear_functions().iter_functions().count() == 0);
diff --git a/fuzz/fuzz_targets/fuzz_serde.rs b/fuzz/fuzz_targets/fuzz_serde.rs
index 1480fabe1..b4f3440b5 100644
--- a/fuzz/fuzz_targets/fuzz_serde.rs
+++ b/fuzz/fuzz_targets/fuzz_serde.rs
@@ -9,6 +9,7 @@ use rhai::{
 };
 use serde::{Deserialize, Serialize};
 
+#[derive(Arbitrary, Debug, Clone, PartialEq, Serialize, Deserialize)]
 enum Enum {
     Normal,
     Newtype(u8),
@@ -24,7 +25,7 @@ struct SubStruct {
 struct NewType(u8);
 
 #[derive(Arbitrary, Debug, Clone, PartialEq, Serialize, Deserialize)]
-struct Tuple(u8, u8);
+struct TupleStruct(u8, u8);
 
 #[derive(Arbitrary, Debug, Clone, PartialEq, Serialize, Deserialize)]
 struct AllTypes {
@@ -56,7 +57,7 @@ struct AllTypes {
 
     _struct: SubStruct,
     _new_type: NewType,
-    _tuple: Tuple,
+    _tuple_struct: TupleStruct,
     _enum: Enum,
 }